Screw-bolt and bttyt



UNITED STATES PATENT oEEroE.

LUCIUS PAIGE, OF GAVENDISH, VERMONT.

SCREW-:BOLT .AND NUT.

Specification of Letters Patent No. 10,368, dated January 3, 1854.

To all froh-0m t may concern Y Be it `known thatI, Lucius PAIGE, of Cavendish, in the County of Windsor and State of Vermont, have invented a new and useful Improvement in Screws and Nuts or Articles of Like Character; and I do hereby declare that the same is fully described and represented in the following specification and the accompanying drawings, letters, figures, and references thereof.

Of the said drawings, Figure l, represents a side elevation of a screw and nut having my improvement applied to them. Fig. 2, is an end view of the same. Fig. 3, is a transverse section of the screw-nut taken through its pawl and the spring thereof. Fig. 4t isa side view of the male screw as it appears when the nut is removed from it.

The object of my invention is to prevent a screw-nut from turning backward on its screw or from being unscrewed therefrom under ordinary circumstances, or when a wrench or some equivalent is not applied to the nut for the purpose of unscrewing it.

I n carrying out my invention, I score or groove the helical thread of the male screw, so as to form it into a row or line of teeth essentially as represented ata, a, in Figs. 1, and 3, in which A, denotes the male screw. I next provi-de the screw nut B (adapted to the screw A) with a dog or catch C, properly made to engage lwith the teeth formed on the helical thread of the male screw. This dog or catch, I aIiX in a recess formedin the bolt, and make it as a lever to turn on a fulcrum or pin D. The longer arm of the lever, I make as a spring to bear against a side b, of the recess e, made in the bolt and I make the tail part of the lever or such longer arm to extend beyond one of the prismatic sides, f, of the bolt so that when a wrench is applied to such side and the opposite prismatic side, g, it shall force inward the arm of the lever so as to throw the dog or catch out of engagement with the teeth of the screw thread, and thereby permit the nut to be unscrewed from the screw.

That form of the leveror pawl and spring which I prefer is represented in the draw-A ings although `I do not confine myselfl strictly to such as the spring may be applied between the lever and the sideY of ltlle e spring serves to keep the dog or catch in engagement with the screw thread teeth and while it is so in engagement it will readily be seen that it will befimpossible to move the nut from the screw'or screw bolt. For certain parts of locomotive engines and various machines wherein screws and nuts are used, and the latter are liable to become unscrewed by const-ant or occasional jar or otherwise my improvement will be found 'of great advantage. i i

I do not claim the invention of a ratchet wheel and holding pawl and catch as com-V monly made and applied to prevent back rotation of a wheel revolving on a shaft; vbut What I do claim is- 1. Theforming of the helical thread of a male screw with notches or teeth as specifiedY in combination with applying to its screw nut a dog catchv or spring pawl to* operate in the said teeth or notches and prevent back rotation of the nut on the screw Vsulostantiallyras above set forth. f

2. I also claim the improvement of 'so applying the catch lever or dog or catch to the i nut, that it may project beyond one prismatic side of the nut so that when a wrench is applied to such side of the nut and its opposite side it may press inward the dog v n or catch or lever thereof, or so act upon the same as to throw such dog orcatoh out of engagement with the teeth or notchesof the male screw so as to allow the nut to be unscrewed from the same substantially las specified.

In testimony whereof, I have `hereunto set my signature this seventh day of DecemberV LUCIUS PAIGE. Witnesses:

`CHARLES L. BLOOD, OTIS ROBBINS. 

